One recommendation for an edit: Following on a fresh Rails app, it looks like webpack-cli needs to be at at least 4.3.0 or it will throw an error. (TypeError: Class constructor ServeCommand cannot be invoked without 'new' etc.)
I had this same issue however upgrading webpack-cli to 4.3.0 didn't work for me. I had to upgrade to 4.7.2 in order for it to run. Not sure why?
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One recommendation for an edit:
Following on a fresh Rails app, it looks like webpack-cli needs to be at at least 4.3.0 or it will throw an error. (TypeError: Class constructor ServeCommand cannot be invoked without 'new' etc.)
I had this same issue however upgrading webpack-cli to 4.3.0 didn't work for me. I had to upgrade to 4.7.2 in order for it to run. Not sure why?